error[E0259]: the name `issue_45829_a` is defined multiple times
  --> $DIR/rename-extern.rs:5:1
   |
LL | extern crate issue_45829_a;
   | --------------------------- previous import of the extern crate `issue_45829_a` here
LL | extern crate issue_45829_b as issue_45829_a;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `issue_45829_a` reimported here
   |
   = note: `issue_45829_a` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
   |
LL | extern crate issue_45829_b as other_issue_45829_a;
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0259`.